Augmented glenoid implant and method of installing the same during an orthopaedic shoulder procedure

Abstract

A glenoid implant includes a baseplate, a pair of bone screws, and an augmentation member. The baseplate includes a plurality of screw holes with the pair of bone screws being positioned in two of the screw holes and the augmentation member being positioned in a third screw hole. The augmentation member includes a non-threaded post configured to abut the bottom of a bone defect. A method of installing a glenoid implant during an orthopaedic surgical procedure is also disclosed.

1 . A glenoid implant for implantation into a glenoid of a patient during an orthopaedic surgical procedure, comprising:
 a baseplate comprising a plate with a top surface and a bottom surface, the plate having: (i) a central opening extending into the plate from the top surface, and (ii) a plurality of screw holes extending from the top surface to the bottom surface of the plate, the plurality of screw holes being positioned circumferentially around the plate,   a shaft coupled to and extending downwardly away from a center of the bottom surface of the plate, the shaft having a number of threads formed in an outer surface thereof,   a first bone screw extending downwardly away from the bottom surface of the plate, the first bone screw having (i) a head positioned in a first screw hole of the plurality of screw holes, and (ii) an elongated threaded shank extending away from its threaded head,   a second bone screw extending downwardly away from the bottom surface of the plate, the second bone screw having (i) a head positioned in a second screw hole of the plurality of screw holes, and (ii) an elongated threaded shank extending away from its threaded head, and   an augmentation member extending downwardly away from the bottom surface of the plate, the augmentation member having (i) a threaded head positioned in a third screw hole of the plurality of screw holes, and (ii) an elongated non-threaded post extending away from its threaded head.   
     
     
         2 . The glenoid implant of  claim 1 , wherein the elongated non-threaded post of the augmentation member has a porous structure disposed thereon. 
     
     
         3 . The glenoid implant of  claim 1 , wherein the elongated non-threaded post of the augmentation member is shorter in length than the elongated threaded shanks of the first and second bone screws. 
     
     
         4 . The glenoid implant of  claim 1 , wherein:
 the plate of the baseplate further comprises a peripheral ring extending downwardly away from, and circumferentially around, the bottom surface of the plate,   the peripheral ring has an interior surface and an opposite exterior surface, and   the exterior surface of the peripheral ring has a number of threads formed therein.   
     
     
         5 . The glenoid implant of  claim 4 , wherein the peripheral ring comprises a plurality of separate arcuate-shaped ring portions separated from one another by a gap. 
     
     
         6 . The glenoid implant of  claim 1 , wherein the shaft is integral with the plate. 
     
     
         7 . The glenoid implant of  claim 1 , further comprising a locking screw and a glenosphere, wherein:
 the central opening of the plate has a number of threads formed therein,   the glenosphere has a number of threads formed therein, and   the locking screw has a first number of threads configured to engage the threads of the central opening and a second number of threads configured to engage the threads of the glenosphere.   
     
     
         8 . A glenoid implant for implantation into a glenoid of a patient during an orthopaedic surgical procedure, comprising:
 a baseplate comprising a plate with a top surface and a bottom surface, the plate having: (i) a central opening extending into the plate from the top surface, the central opening having a number of threads formed therein, and (ii) a plurality of screw holes extending from the top surface to the bottom surface of the plate, the plurality of screw holes being positioned circumferentially around the plate,   a shaft coupled to and extending downwardly away from a center of the bottom surface of the plate, the shaft having a number of threads formed in an outer surface thereof,   a pair of bone screws extending downwardly away from the bottom surface of the plate, each of the pair of bone screws having (i) a head positioned in one of the plurality of screw holes, and (ii) an elongated threaded shank extending away from its threaded head,   an augmentation member extending downwardly away from the bottom surface of the plate, the augmentation member having (i) a threaded head positioned in one of the plurality of screw holes, and (ii) an elongated non-threaded post extending away from its threaded head,   a glenosphere having a number of threads formed therein, and   a locking screw having (i) a first number of threads configured to engage the threads of the central opening and (ii) a second number of threads configured to engage the threads of the glenosphere.   
     
     
         9 . The glenoid implant of  claim 8 , wherein the elongated non-threaded post of the augmentation member has a porous structure disposed thereon. 
     
     
         10 . The glenoid implant of  claim 8 , wherein the elongated non-threaded post of the augmentation member is shorter in length than the elongated threaded shanks of the pair of bone screws. 
     
     
         11 . The glenoid implant of  claim 8 , wherein:
 the plate of the baseplate further comprises a peripheral ring extending downwardly away from, and circumferentially around, the bottom surface of the plate,   the peripheral ring has an interior surface and an opposite exterior surface, and   the exterior surface of the peripheral ring has a number of threads formed therein.   
     
     
         12 . The glenoid implant of  claim 11 , wherein the peripheral ring comprises a plurality of separate arcuate-shaped ring portions separated from one another by a gap. 
     
     
         13 . The glenoid implant of  claim 8 , wherein the shaft is integral with the plate. 
     
     
         14 . A method of surgically implanting a glenoid implant into a glenoid of a patient's shoulder during performance of an orthopaedic surgical procedure, the method comprising:
 surgically exposing an outer surface of the glenoid, the outer surface of the glenoid having a bone defect,   reaming the outer surface of the glenoid so as to form (i) a circular surface in the outer surface of the glenoid, (ii) a central bore hole that is concentric with the portion of the circular surface, and (iii) a circular groove that is concentric with the central bore hole,   inserting a baseplate of the glenoid implant into the central bore hole and circular groove, the baseplate having a plurality of screw holes,   aligning a first screw hole of the plurality of screw holes of the baseplate over the bone defect, and   inserting an augmentation member through the first screw hole such that a bottom surface of a non-threaded post of the augmentation member contacts a bottom surface of the bone defect.   
     
     
         15 . The method of  claim 14 , further comprising:
 inserting a first bone screw through a second screw hole of the plurality of screw holes of the baseplate such that a threaded shank of the first bone screw is threaded into the glenoid, and   inserting a second bone screw through a third screw hole of the plurality of screw holes of the baseplate such that a threaded shank of the second bone screw is threaded into the glenoid.   
     
     
         16 . The method of  claim 14 , further comprising:
 inserting a locking screw of the glenoid implant into a central opening in a top surface of the baseplate, and   coupling a glenosphere of the glenoid implant to the locking screw.   
     
     
         17 . The method of  claim 14 , further comprising reaming the glenoid around the bone defect prior to insertion of the augmentation member.